Enhanced Triethylamine Sensing Properties by Designing an α-Fe₂O₃/α-MoO₃ Nanostructure Directly Grown on Ceramic Tubes

Abstract

Over the years, efforts have been made to develop simple and efficient techniques for the detection of triethylamine (TEA). In this task, to solve the problem that the powder easily falls off in the conventional MoO3 sensor preparation method, we directly grow α-MoO3 nanosheets with a high TEA sensing response on Al2O3 tubes through seed-layer-assisted growth technology and a hydrothermal method. Furthermore, to enhance the gas-monitoring performance of the α-MoO3 sensing element, nanoscale α-Fe2O3 particles were deposited on α-MoO3 nanosheets through a pulsed-laser-deposition method and the binary composite nanostructured materials were designed and fabricated. The morphology as well as structures of the α-Fe2O3/α-MoO3 materials have been characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, etc. The α-Fe2O3/α-MoO3 sensors exhibit a superior performance toward TEA than the pristine α-MoO3 sensor does, such as enhanced sensitivity and excellent stability. The mechanisms of enhanced sensing properties are discussed from the points of an α-Fe2O3/α-MoO3 N–N heterojunction based on the depletion layer model. Because of the general working principle and controllable growth strategy, this study provides a way to design and prepare chemical resistive gas sensors with high performance.

Urchin-Like WO2.72 Microspheres Decorated with Au and PdO Nanoparticles for the Selective Detection of Trimethylamine

“…The reaction will form an electron depletion layer. The detailed process is shown in eqs and . − The gas molecules react with O δ− (ads) to release the electrons back to the sensor once the target gas is injected, causing the reduction of the electron depletion layer. − …”

MoS2/WS2 Nanosheet-Based Composite Films Irradiated by Atomic Oxygen: Implications for Lubrication in Space

“…Based on the analysis of DigitalMicrograph, the structural evolution of MoS 2 /WS 2 composite films across the cross sections identified on red rectangles 2 and 4 in Figure f,j can be divided into three regions: (I) the amorphous oxidation region, where the TMD crystals are destroyed and oxidized into an amorphous structure; (II) the TMD/oxides mixed region, where some TMD crystals are oxidized into MeO x nanocrystals as evidenced by the fast Fourier transform (FFT) pattern in inset images in Figure g,k, and with the spacing distance of ∼0.21 nm corresponding to the (210) plane of MoO 3 (JCPDS Card No. 05-0508); , and (III) the undamaged region, which exhibits a highly ordered MoS 2 crystal structure dominant in (002) and (100) orientations. Moreover, with the increase in content of WS 2 (e.g., No.…”

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

“…In parallel to diverse nanostructures, composite materials without any structural modifications were also utilized in TEA and TMA sensors. [346][347][348][349][350][351]. Herein, ZnO/ZnFe 2 O 4 composite displayed a good sensitivity to TEA under irradiation (R a /R g ≥ 9 for 500 ppm at 80 • C) and requires additional interrogations to enhance the response [346].…”

“…In parallel to diverse nanostructures, composite materials without any structural modifications were also utilized in TEA and TMA sensors. Materials such as ZnO/ZnFe 2 O 4 composites, Au/Co 3 O 4 /W 18 O 49 hollow composite nanospheres, α-Fe 2 O 3 @α-MoO 3 composite, CuO/ZnO 3D diamond shaped MOF, rGO decorated W-doped BiVO 4 hierarchical nanocomposite, and Au@MoS 2 nanocomposite were effectively consumed in TEA or TMA detection [ 346 , 347 , 348 , 349 , 350 , 351 ]. Herein, ZnO/ZnFe 2 O 4 composite displayed a good sensitivity to TEA under irradiation (R a /R g ≥ 9 for 500 ppm at 80 °C) and requires additional interrogations to enhance the response [ 346 ].…”